entryways, entranceway, doorways, walkways, barricades, gates, vestibules, passageways, stairways, egresses, staircases, checkpoints, exits, breezeways, archways, plaza, guardhouses, egress, intersections, bathrooms, vehicular traffic, thoroughfares, restrooms, signage, perimeters, courtyards, hallways, railings, alcoves, concourse, ramps, shatterproof glass, bollards, walls, balconies, transepts, chainlink fence, buildings, porticoes, facades, crosswalks, corridors, driveways, sallyport, stanchions, doors, sidewalks, cloverleafs, loading dock, peristyle, lanes, pickets, barbed wire, atriums, cordon, detours, parking, travelator, frontage, arches, crossway, signboards, alleyways, throughway, crossings, junctions, waysides, gatehouse, fences, pedestrians, boulevard, colonnades, spaces, crenellations, clerestory, berms, flagpoles, minipark, stairwell, parapets, exterior, sawhorses, breezeway, foyer, balustrades, hardstand, promenade, tunnels, louvres, garages, elevators, toilets, fanlight, roads, receptacles, ventilation, canopies, medians, sentries, hymettus, loges, inlets, entrance, gateways, entryway, chambers, bays, openings, gateway, routes, vents, channels, drainages, fronts, niches

enigmatical canon, enigmatic canon, enigma canon, riddle canon